Motion In A Plane

If two stones are projected at angle $\theta$ and $\left(90^{\circ}-\theta\right)$ respectively with horizontal with a speed of $20 \mathrm{~ms}^{-1}$. If second stone rises 10 m higher than the first stone then, the angle of projection $\theta$ is (acceleration due to gravity $=10 \mathrm{~ms}^{-2}$ )